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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '35ecead4a2765bb5149ed848cf7738a3912844d9020cd6c0bfa00783776917b4' 
  AND token = 'fAM8W09rGoGXlgaen3tRhUXjqPd8fpN0SkRYoqHuYSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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