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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6179380c095ec1d72aaafa1abb110c5f3fd7793ce584f83cdff73764b97de50f' 
  AND token = 'sgoPkQ8KXQX1Y9liHUGdKkcs0O/GE8dLRID42DRYDH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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