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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4a4ee5a8ab1eaad542812f5c306a01bc42a064628b72b215c97e29e437d39a61' 
  AND token = '2jQRIfEnKjI+RgzVgBNYywXsA7trE5XOGY9n7OAIErA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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