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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e22b82ddfb99bc4ef6d50c1ff159c08799708f8fc08c30a3a82834d588e0ad91' 
  AND token = 'C1LR7UcL76Y916laxvxRt+7+ZZLa6STeb6Hl8foxUpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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