Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '186315a776a16ea4f56eac20d2692e6834f043293b0bee00194d137b5a6bb102' 
  AND token = 'mksHgFhHRZyadd+/+pEw3LX12a6LB4SeHLYlcnaNlsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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