Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847a55966fc3a9d2de3f10b73cde53f0940e5edadc51dc2ef82b2cdd37d0b9fd' 
  AND token = 'BneT98/CpUlrI2/ku7Vk0wMnsevLGbDWy81c7qEBpSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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