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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '632aafdbc6e56ea5a5232eb6402f628bc4905b9383a9d700b7936fd6a4dec380' 
  AND token = 'HntanCt2i/0Etguo87xgSIuVbRqQ0AeKr4oSwUs2LVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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