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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ff66da6bf6e5a828f021af6c47a765a71dbcc59333680a5f727fcf8d92084163' 
  AND token = 'tLcBRMQ7qNwuhHQqzxk27d522Kr87UBA4NP+0D2IV1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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