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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ff261ac8f1dcbaaf34dc4cfddb1e103c7898e912a37e233a3e157c9d1fb65ad5' 
  AND token = 'TiBZuWzzAOtcWvzUMxh03IZM3xHyTe5DTkKKUOQoIPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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