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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c9f400dd153f593f93ceb7a4757cabe3c55aa552f3c2624fe3a23454e535a45a' 
  AND token = '02IYeNgjg8Ufe5w66huu/fSwy11rp0MYbhzhpHqROFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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