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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cf331d89793768b18e0df22ee0f3c16f3ee83118aef189168657726158504d5e' 
  AND token = 'hVnyq960AT3fwgBwkDgZvaCTRkN/3144M6Dj7U/NHiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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