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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7dcbbf0cc0a5c1c442260e317d480bd2617009a1d42542c73cc49ee48467474a' 
  AND token = 'q2G1HFDnGLtJNQZq+iR1OOS10kjGtZOhg/cvsaHtUWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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