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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b239fec20fdff1cc376f8925c2fdb2c7014af0c41dd20d20aeeffbba9281dcaf' 
  AND token = '39cBgSHvfwbqtCGxbiijeQY2Z8Wot1L3gOujq362VDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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