Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f589454f2c5e4fd76b05fac1921b4af05dd5797f8222abb3913a70bfcdff66cb' 
  AND token = 'rbl5Gv2P/jJaTK2Ie5paZfAKm4yxE/l1nUo/hs4fcRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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