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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2077b9d545080d4f3f0c167323e77752f3a7c89daa6f5ee967b5f932eeeaff15' 
  AND token = 'gup6BXjlJrjmpKav+1K07dyE5+v77sOkdWag8AOGOVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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