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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f336a2911c13c8ad360466dd6bc82d77d72c2949b52feacf51606a3a6e3e9613' 
  AND token = '1PDTvm0DCY1l683Ypdgh649R5TnYgvG9G8KfJ7gHly4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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