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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f1c5ed12ef5440483a84129ae951048339cf32d7c4b69fc1650a2a2e14b9aa94' 
  AND token = 'LZVbr2etC13iA5MydUD/wS9Vo8HzJ1ku4uaPfKFfCGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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