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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e5729d0d2a80670d84626c4fb73a3a5d5270b2ed3e01225a9c24901498e7068e' 
  AND token = '6iFl3wpIiSN7Is5Owm+R7Pge5NCrvgIA/f83q6LVDcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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