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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd2f26434a44e6db732b6fc3af460c32102628b1511e9da8b08f5c93c9a619d44' 
  AND token = 'lI7xctd706gAdHFL/EV24QY6DmWPbGMa2dbFX1a2skw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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