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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4d5ba36426813f0e5c82d62932c6bdd0c5ac7a37708baf183cc5763d6cc6627a' 
  AND token = 'TaVWTEIARBeJtIVpZW3biwh2PtoVr2A1hWB+JOrsbA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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