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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9c9711a67420a21df8fda7839bf79d58e55db1ebde2251563e8fb9ce3887915f' 
  AND token = '+ePpyukVW+5Ab6Jkza00jRnEX3ZkylN5SnoOknrJFAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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