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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8b2ea98e7b59e301fc4d1f60483a7836f1103e647c50499aaa1b5e2eedc8e4be' 
  AND token = 'eYtDlAv/u8l/IHlDlghketcavdA9tskVvGnDgIgwdvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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