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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1687a89b40984781b762ebbd3591ce280c37fba72131f70b890cd9d903e1d6e1' 
  AND token = 'Hgylow+KDtezq+Ts60cHqDu50atiC1QdHSzakW31S4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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