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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '760a1234d3da730c2e1469eae6b93e2b5ae5325633f1a0d3a43341ab1e5039fe' 
  AND token = 'SCviVwQdqrCxKw/t/imuWuQMOBv1bMOhPkvkd0stmE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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