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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '713ac406f39aec32ae4a65c7778a6b25d7840d626a81b5ad2914ef31d543ab6b' 
  AND token = 'JqPY8j2G3LUt2N7VkVFtawdUzR9v2OB5TLaqJWzaed8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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