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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '23bd1e63e3c8b30acdd7effa4af6bdebc00c7c7c9692b2a11cc614e6e3ee549b' 
  AND token = '0WxH84QxJdLl/wzhrHVCgGr3GXN9jdlWzfn60jqzezI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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