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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ae2e9b7f8f25ae383f84ca8d34ac77bc4862388b946f7ca37b4f136a3e33df9b' 
  AND token = 'HAC8Ua9NZ8NOoF7yGPp86CY9ltlxPGLfVk+zn5AyhnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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