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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '93db8331a5147465852a057119f7e5c87f68770df6a8f0162ca056cd61fdde3c' 
  AND token = 'it+pegF4CI2T+etteRRX7CGY1nPtQLM+dehSwX6sLR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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