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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1d25417281e906654d19eae40130e1e6f8bc56c6e30c7783eaec30d91cc9575e' 
  AND token = 'YQMfHxTPblZ0p9MzwWgriQoNs1LcJwSNk2M54J3nWmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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