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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2f7f0bf5b9f37618427f566eabc8c7dea79d58c0d780bd5829cc847157e524d8' 
  AND token = 'nUz2Fu48KEzerW9ZTKp9I3AGaJ0JbqTC1V9EOLOa+a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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