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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1d0bccbc9969f2c47cec2c280e070f07c68bc965f8f392efc461bb1729cf2673' 
  AND token = 'FB0WCB3g3MPNLmtaXSVhoU3BgLmegSJHuq6seNOBtsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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