Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e0ac42dfbaba2d8642150c6f0ef04b764069602006236660e28c4b3d0198a1' 
  AND token = 'E4xdylBV1BIpBywvluDTxOmX1UO+pZFIJjH5XLWCCoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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