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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '848df27cee59732045671b3c4f96664ed83c206f1e4a0314547874c1a670dc7f' 
  AND token = 'TY5fzjfTfzKb2vM/RtahQe4CveEd3OvMmjDLPVnAoec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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