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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '69bba93a251713c344b63b50add1cecfe1087b718434e011e3a40499db78a231' 
  AND token = 'N6RPLSLJ1Qt2oiw5oQl30he48/UpUwQQelr/+amGBPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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