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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '534135a302c9e351aff3cf82ba02795cc81a78edc5f9ad41038b9d5fad74abfd' 
  AND token = '+uZSbVJ9NCAxKDm5DAnMeyJPToa+pv3tgx5S2VZIzWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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