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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1e1c884e8e600cc7cf1f4eefe4d9b82c68c13f120e98172f2a50234ecbd832f7' 
  AND token = 'vDvLz3q2PQXzqfA46Zu5qJzpsGJd9/d01dQz0YX27xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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