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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '07634e1915172960151e2c397a5580c5995c7eeaf5f25e68c8df645ae042c5d7' 
  AND token = 'HeY058ow3cmUmERpHfANkUyQbgd+krtY8Ja4umBiglw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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