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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a409b96ae383de94aa7a8dd632746a9ca20155bc3511e4f059bcbfe6f4dbfe1f' 
  AND token = 'IzAPWJG05oQbRW2UFX5U1dS2IFRAfeHzUadYpOkScPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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