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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '667aa4425e4355557e1cfb9f4631f6d3013daed2581c6951bd0d3a23734a6fdf' 
  AND token = 'GaeV249Btl/3qcMfTp1u8XAmLXxXso2N34kJhpVdgkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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