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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ff27b2cc611ee39afd16803467ef34b308e05f83eadd61d1388d954f4353c95f' 
  AND token = 'rjqRnUOJEo82p9lB3Jaw5qTpDjOilFY4MjSzfuNW5eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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