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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '67107b48dcbe7d52edfb7f5d57dd5ce075e61cf8a842482e8f513aef6fe58846' 
  AND token = 'ds4aR4PEn+XojI0eWDrNeW3bZ5rUfL6AIQQpBQKknxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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