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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0f696dd0f674aadac0f9e3073f0b7c41f4f91b42952f77adcd6e0395cd547ad2' 
  AND token = 'qUxe7rqdpsSz2bGRWDtrNO7rQbSmBHIKK40yWivQHXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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