Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ea97d23fc4969358114e72317926e799333434caae9074057da9d3f97daefe' 
  AND token = '6F6csW4RO38PI8glYWwvbnVZczOPZFseAJNDbBINO54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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