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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cbd8c86aa2e927dd3e083758be02e52741adacc8f06c02807581a9b180114533' 
  AND token = 'eNh8DgtJ6qrm6JG13vTjrC1NwhBAKJNCKu6RtPlMAhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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