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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '89060e44b51cb7e934e31fca85cdc232277177219576f1a21a747cc83d6c021f' 
  AND token = 'QEt5cttVmokTdzDNn93BJCqzatuYfOCY6x2OhkRdv64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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