SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '73ff3a99f95d1967d7c6741274375e78f554c4413740fbba2b8c281187e399b5' 
  AND token = 'Ev7GEYSFKboL59Trk/SZa0p+wnjzWItY/YrdjL+Kqqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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