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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba83dda9a68546e2fc61bcfec08e0a6b647ccb9ffdd5d1b4a63ef22002b07a53' 
  AND token = '5MWPNvtHA/5dDiMYlC7mjWjI421rms6NkaSdS2aQs6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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