Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811aa1611b65ce691dc1b90c5eb40954f5dade84bbeb8386d6c91d3e1e17c24c' 
  AND token = 'yMeIXDYcpI4wjSmet7oMTF5fV5Pw6R+kQpuVSKcffL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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