Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8eb7c03d9eb1e6a4518fff0d6508a6032b7991ad57291f081db6835c11b036f' 
  AND token = '8UEq0s/h3i7RBNAVsfz5N7z3gto6C0kfjxp0nA8HqgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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