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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea19f7c59bbf6764b5b098d24cfaee3cce0068d90fea068aa3f8d7e7e2c2a1be' 
  AND token = 'fCmBbL+G44cz9yVjY3AYITUl4nZ1u/ketfbFuWwS7h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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