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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f178edf1fa615223f82c3683d40d6b9e58ab26453bac7816117039f2a41deb28' 
  AND token = '1GfLE8CusokzxtDxMS9gV4SAhlrsWlvravYw31iJGH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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