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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6bd3dc1877add4d8f4c5fc37044d5a3dee65457f0e14aa26f2792f3e9c39fbdf' 
  AND token = 'pTA5O+MW/EtuIR5Am4efYrhrJlGatRaH+8gtUw6eOHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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