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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd399db3bae3e9be3158f3f3ec3869b2dcaa19326c37ae21804fd93cfaccb304b' 
  AND token = 'gd/80Qqr290To4wftM0//wx4M3UPhhl37MCnixK+Zyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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