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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e078d9a513acfc886d65243424aaac7fad8d77d27e7074323ad5f74192d87408' 
  AND token = 'rqqyiUrecokBqJwEA3vNa+N8eWfQmpDIX6kgx+Mog44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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