Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad93f4692acd827e5d6bbfaaac8f23da8da3be3cd52350d359608ea8a71f5f23' 
  AND token = 'Rb/K+Y540jzs2HKYt6KD+lhXuLVhSGUfrM1OBWcjdbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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