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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3649e387cf900ddf26fc48f019ce8ebd9c4f230b13f2dec8902b361f70f4a267' 
  AND token = 'rabazJkMBsfwj/OFo9bl7Sok2/RsVQwFZknCufxJVi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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