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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6b8a8a4eace1f0f895e7a9d19a1e922ad394078f68a6a84b19184320ce41a7fd' 
  AND token = 'fT9ikctR6om6wbDbVOu6dNIET9Y/BmsQhHw6soNFzJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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