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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '708347362c828c3e9a2c05ac71852af771e780f66a9d931a437662817d6946f9' 
  AND token = 'U7w8mnnBg6CZaizJWIbfE6IMVF72rdlQccuMXg2iQbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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