SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aa0ea7585fefadca34521bd30da8eb76fe507dcee58277bcaf8d4fae853db260' 
  AND token = 'DzdDY+1hOKXql/X2vjmMTwmCJn2GmNvZjmj1dWpte6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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