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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aca729bd9b3f7ca9b4128193bd05d37ba261b6901cabaa5645d12a9b2f1a8a56' 
  AND token = 'f6tNyiHAXult5RkoN+sRZ1aRff31b1kFvXkKqrtmzcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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