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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '32ef06353f1366572e25fecd981a69fb93278b0ee0a80553078d5d6a2e1a00b7' 
  AND token = 'BdUxsBxdHRgHlVasooIqeedG0CtHXk9hMFpGuK+ew3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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