Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10f050de18629cf9e0730788693acabcdb5451e41059977e25dea2d3c6fb639' 
  AND token = '0QXklDqTqmXPkL8NAw5nC1344nVSjb5b/V5cKy1gwgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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