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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bbe0d1e83c74786f8100f51f10cadb754a6ddffeaaf952ac4bc43db4cfb0ae99' 
  AND token = '36rKp+MWSpT9MwMsGPWKXxYot4MZPridlZEjmsVbVyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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