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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '31f3120bc27b158cd9c3e0ef7051814b708e5fbfdb0ff75e25fffbc73c5f17cd' 
  AND token = 'O399zIWbrlEsaLyjoucX8KjTPFB1iTgC/FYadDs+qug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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