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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5e92048620b5d7ffbd2fb26bc8df4ca366e8eb44f435d2ad1dcd734084a6f2ec' 
  AND token = 'HgoDXvgRQSaz0c7xcLEyOtVrh7qq1FsNLV0QO2B7F64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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