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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '249f92698f78e3460ce68248f72422c41b272172708392b4d179772e18a2ef34' 
  AND token = 'n9zcFZwV/7QKu5hXY2SyzIMUfbK1K5zyO/tce3eR30g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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