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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '50f21d679ce952f6bc00a07c0d89f7c561e804b9c7df60e3c0a59c5ce10dcb65' 
  AND token = 'Ldmis5l5WPLYgoGQlHDn/vcLuET22a2UkQq8DfTVYeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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