Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7765bf8535cce43bb8aeecbf95e81997cbc2e37a51c177a243d4e179d76bb1df' 
  AND token = '1+vySPF1MVWiHAFVFvTbzmywtpHmlSgNA5WumPevdvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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