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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f6ae09b79572aab6dc559018b98408cfb4fcaf9703ac587046e52ed7f70d0572' 
  AND token = '2sslApHm2bnVBtlwsKWDnKvt6LShk0gytr5bSheaT0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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