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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '98b7ac6fdf15d8d3257f1c9f479b0cd375e55cc6d1e7877f839ee13395cb0ebb' 
  AND token = 'Hz5OEM+eHMUVPnwKabsX+QqHzO+xqe5VQ2g5QsVedeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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