Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd473f7e11e8f42f0dfa3deca77325ca5ce707de217c2f8884151b7e02c95e4bb' 
  AND token = '2ARgBMRoZHzGMfedbI1Yp8wRp+ZMSUSwkayM5vhvUmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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