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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c6f2b9d006018788c298bb14c9cffec0580a4e46275e9ade41ecb2ab93a8a343' 
  AND token = 'pAksnYQQdie8UviaVCg6/u1QVZ0O7+tz3vPzot8K20k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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