Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324e812aca37d7e8abd8936a6f05307fbf09dec9e6ab6ace80ab5f9d020739ea' 
  AND token = 'JPycWSQCd+gmqylEHLYZBYSsf95nYKaQyVJcl8ixg6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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