Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492f3941d6c5074b2fb33476ecb32fe4ca716f9bf8d6e9fd550389fa9febc989' 
  AND token = 'djCxiamskGQjNH2d+CmRj6IdzIkeAU5DNUa6734Q7G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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