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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '97b6751798de1b3a8679055e0c9aa8f842d7012722c9f1a31a4a27a243f2c9cc' 
  AND token = 'AbPWB/IdRDp2h/0xtgVNvbEWAsbXeKNCD7K3awSTW0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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