Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5dfc6278a3455705e6b976d43d71a40ac088043460e6d1c32c14c4bf7ff636d' 
  AND token = 'CmjRPosGaYktR16USrp1eYMRQMX08kHNfDFraR454Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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