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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd29e835445c11a43328166def69487917b7665e4ebac51fd357d37fd8348d4b5' 
  AND token = '/Simyv8oBde+HJWvQ8tshIUWJrwrq5fVEVdeHhm85m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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