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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '94937b6017a28bc705a9c0d4049c98eac391d2e720f919138ae8e250f3d803f6' 
  AND token = 'o4QVsdWSvk4t+jGOUqEClLHCmMev+WtkddskbliojRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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