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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '58edc57c1e713f893ae956aa994da34a9d56a0175c360e4ab930442e70ca304b' 
  AND token = 'K8tSbIzARPRLQu38+7Aw516Dr+ppdHQKBFd0pzzmGdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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