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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '281feb127a0e598566d87e4885b75b7afb7df76c27ce6675eaf1c26d831db40e' 
  AND token = 'hob+D6TLa57CmvL28Xxi6KnjEWVJ6H0Tx+GiwnSqO8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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