Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4b3657cbce621ebba278e417773997358d03ca9a425093c27d5abded20804a' 
  AND token = 'fUFcLKT0WAPhhPQQseI2CUaiTMtH2BytyMl3fiacvlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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