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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e62c07d9fca907040c779a68a067026464e13d9622b33efea1907f803b798de7' 
  AND token = 'WkVJi5qF3nNEpcqHnD3Cx9nLsA47ClDFA18qd99spaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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