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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f4af45d7c3eb74061d48136abbf993c689e84c5ab23c6c047093b97c3a01b7f' 
  AND token = 'Ell6lbnguHvV9OV7/Jwg14aCmuUno5/ukX7TpbuCg6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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