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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '61affece58ed038b2e8adf5f55fda11ecc8b6a9da8a608bd38f0ec25b9e9d4c8' 
  AND token = 'Vg/48OgRr/MZi4CaUTczcGbcEO1tts7bZGc6T2HXczU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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