Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ce7e4f5e662499aae358995254520eb6dc722b1977250e0093c1203bb08921' 
  AND token = '7Kv8GtHy6rgiPJKpxosZsvKYasoBXJS9xkM0tTHyiO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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