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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '99e5702fd271824013f7f47abf6571f130547e6ef47c5cce4752923b32458d90' 
  AND token = 'TOpAX6rtRT0kMSpkR8wi0MnMFBFkjOgKV1BNcqn4x/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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