Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8c5fe940b5c3dacc33f8ff5a3be55f4806d96bd94a23eb2b02c86f01ccd4fd' 
  AND token = 'HmSD7RI6Qo1DUP21xbyFanxgLNjeWne8uRoLBDXjWeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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