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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d55c2c1ad5f8ef4a89b9a5923ca9e4129d3df7c6fb93c9b85219556d3fb255f' 
  AND token = 'l4RgHmD257d6Ia4M0JN50Q9kpqd5NJdes8FZYPE0cO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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