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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2d2682ced070fa485699601ddf5cf4ff06943a7cfb688e2491cec876860e652d' 
  AND token = '92L0HpNpZ0t85cdBMhQ4lkxD38775LJjehQtQ+wYme4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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