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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c523c1b095892e657346cbd70b1c63ac0419345441879288c02fe36a062ea932' 
  AND token = '2I9KSRfAwrl979R8ReKJ5EJEbWNXGQaprXMR/1WYcys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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