Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4cf73a08007c6beeb51d2f0d2799622ec86ba64e3a38b46f502bafa4fcaecaf' 
  AND token = 'KP9d417HtR//WYEVgxR425MeoOD56szISr6C8mQ+1/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}