Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351d562a288d408e99df6b403682c5ac874b0b08319d1120e084daf601cf9219' 
  AND token = 'RjUSl/YNDqazmx89bSJkYdpTGu2dZVEp/dfeCCUZolE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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