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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f9cc6d81b00a10440b7a012c47000cc9003fcb8d16c3e0986eb96a23fc68ec84' 
  AND token = 'KKgALWkJxOW+mQyOSECfCn4LZz9wnaUd0NQwWKkAqpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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